Malicious PDF — malware analysis report

Static analysis result for SHA-256 1565f55fc57ad2f6…

MALICIOUS

PDF

36.0 KB Created: 2020-04-01 23:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: be6c49143bf946fe24334fbd240c37d1 SHA-1: 11ed91d0b2c1160c604d915e714fbf19113e33dc SHA-256: 1565f55fc57ad2f6321cade663ccc016c7e4e9b926cf9aa7418355382038e714
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains numerous external links, many with numeric slugs, indicative of an SEO link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URLs suggests an attempt to redirect the user to potentially harmful sites. The document body's content, 'Exercice carré rectangle ce1', is a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://blazzous.com/uploads/1/3/0/2/130289154/130289154.html#exercice+carr%C3%A9+rectangle+ce1
    • http://beyondhillco.com/uploads/1/3/1/0/131070298/2a7434d731.pdf
    • http://kenplattlaw.net/uploads/1/3/0/5/130589137/8341e202b8437.pdf
    • http://amityhcs.com/uploads/1/3/0/8/130814401/duzasomoxokef.pdf
    • http://jeltefaber.nl/uploads/1/3/1/3/131398541/1008115.pdf
    • http://myonepynt.com/uploads/1/3/0/6/130639209/jotugidesa.pdf
    • http://centrodocauto.com/uploads/1/3/0/8/130874260/nugiru-jizisexuxenivu.pdf
    • http://lewisgerrishphotography.com/uploads/1/3/0/3/130313180/6b53193be369a06.pdf
    • http://gigimacproductions.com/uploads/1/3/0/4/130435990/nifado.pdf
    • http://3axisphotography.com/uploads/1/3/0/6/130621055/3799780.pdf
    • http://jenlynns.com/uploads/1/3/0/8/130874516/tovapojetofoxuf-tubutexu-nujogoxuwaj-famejofumemo.pdf
    • http://thepursuitoffreedom.com/uploads/1/3/0/2/130289341/2946082.pdf
    • http://michaelsroofingco.com/uploads/1/3/0/2/130291434/2cbea03a.pdf
    • http://theluckywood.com/uploads/1/3/0/6/130639246/paxafipunexezeb.pdf
    • http://freshonwheels.net/uploads/1/3/1/0/131069997/xasop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d7.bin
e9f09e93df18ba47ba1fd2e796c2c28f7e533171a13e35bcfe0f4eb9bc200d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D7 8144 bytes

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